Hair straightener



FIG. 1 is a perspective view of a hair straightener showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a perspective view of the hair straightener where the hair straightener is in an open state;

FIG. 10 is an enlarged view of portion 10 shown in FIG. 1 ; and,

FIG. 11 is an enlarged view of portion 11 shown in FIG. 3 .

The broken lines consisting of evenly spaced dash lines in the drawing depict portions of the hair straightener that form no part of the claimed design; The broken lines consisting of short and long dash lines encircling the enlarged detail views are for annotative purposes that form no part of the claimed design. 

CLAIM The ornamental design for a hair straightener, as shown and described. 